Door check



@12ga N HOFFMAN @B DOOR CHECK Filed April ll, 1954 Livi/MEW 7 INVENTOR.

ATTORNEYS.

atented .Aprm 28, 1936 UNlTE STATS DOOR CHECK Laurence N. Hoiman, Shelby,

The Shelby Metal Products Ohio, assigner to Company, Shelby,

7 Claims.

The present invention, relating, as indicated to a door check, has for its more particular object the provision of a relatively inexpensive means for retarding the closing movement of a door and embodying certain novel features which will permit the door to be swung open to its full extent, viz., to be swung through an arc of approximately degrees.

Another object of my invention is to provide means whereby the door check may be quickly and conveniently installed and assembled. Additional objects and advantages of the invention will become apparent as the following description proceeds.

To the accomplishment of the foregoing and related ends, said invention, then, consists of the means hereinafter fully described and particularly pointed out in the claims, the annexed drawing and the following description setting forth in detail certain mechanism embodying the in- Vention, such disclosed means constituting, however, but one of various mechanical forms in which the principle of the invention may be used.

In said annexed drawing:-

Fig. 1 is an elevation of the door check as installed upon a door and door frame; Fig. 2 is a plan View of the structure shown in Fig. 1 and illustrating, in dotted lines, the various positions of the movement of the door and door check; Fig. 3 is a perspective view of the door frame link arm; Fig. 4 is an enlarged sectional view taken substantially along line l-l of Fig. 1 in the direction of the arrows; Fig. 5 is an enlarged fragmentary view of the outer end of the door frame link arm; and Fig. 6 is an enlarged fragmentary perspective view of the outer end of the piston rod.

Now referring more particularly to the drawing, there is illustrated therein a door l which is hinged to the door frame 2. Spring tension means are provide-d for the purpose of eiTecting closing movement of the door. In the particular illustrated instance, such spring means consists of an ordinary coil spring 3 attached to the door and door frame and having connected therewith a short rigid link l which` is for the purpose of bearing against the edge of the door when the latter is swung to fully opened position and to prevent the coil spring from marring or injuring such door edge. It should also be noted at this point that equivalent spring means for effecting the closing movement of the door may also be utilized, such as springs incorporated in the hinges 5. Such spring door closing means, however, are well known to the art and constitute no part of the subject-matter of my present invention.

A cylinder 6 is attached to the door by suitable fastening means such as a wood screw as at l. The cylinder 5 may be either pneumatic or hydraulic type. A piston rod is attached to a piston (not shown) within the cylinder Inasmuch as such iiuid cylinders and pistons are old in the art, further illustration and description are dispensed with. Suffice it to say, that any equivalent means for retarding the uni-directional movement of a member such as the piston rod 8 may equally well be used in conjunction with the present invention.

The rod 8 is pivotally connected to a link arm S which in turn is pivotally connected to a door frame attachment member l0. The end of the rod 8 is transversely bent as at ll. The rod end I l is adapted to be received in an aperture l2 in the link arm 9. The link arm 9 is of substantially channel shaped cross-section and therefore it should be more correctly stated that there are two apertures l 2, only one of which is shown, in the flanges of such link arm 9. A projecting lug I3 is positioned on the end of the transversely bent portion il of the rod il and is adapted to be received in an enlarged or relieved portion lll in the periphery of the apertures l2. The relieved portions It in the periphery of the apertures l 2 are so positioned that the rod 8 and lug l2 may be inserted therein upon initial assembly of the door check, whereby the lug i3 will not register with the recesses ld during the pivotal operative movement of the rod 3 and link 9. In this manner the rod 8 and link 9 may be quickly and conveniently assembled, either on a righthand or left-hand opening door, and the lug I3 will serve as a means to .prevent disengagement of the two connected parts during the operation thereof.

The door frame attachment member includes a laterally projecting portion i5 which, similar to the link arm il, is also channel shaped and adapted to lit within the lianges of the channel. The link arm 9 is pivotally attached to the projecting portion l5 by means of a suitable fastener such as the rivet i6 A raised rib il is positioned on one of the side walls of the projecting portion l5 at a point removed from the pivotal attachment it and is adapted to make a wedging engagement with the link arm S. The end I8 of the link arm Q extends over and beyond the end of the projecting portion l5 and is adapted to bear against the portions i9 of the door attachment member l0.

Now, referring particularly to Fig. 2, the operation of the above described device is as follows: As the door I moves from closed position to the position denoted by the reference character A, the piston rod 8 will be drawn out of the cylinder 6. Simultaneously the link arm 9 will remain in normal closed position by virtue of the retarding effect of the raised rib l1 wedging against the ilanges of the link arm. However, when the piston rod 8 has been drawn out to its full permissible extent and as the door swings from the position A to the full opened position indicated by the reference character B, the link arm 9 will be withdrawn from the wedging or binding effect of the raised rib I1 and permitted to pivotally move to its iinal and full opened position. 'Ihe closing operation of the door is of course a reversal of the foregoing cycle of movements, and the piston and cylinder S serve to retard the closing movement of the door from position A to fully closed position. It is also to be noted that the link arm 9 during closing movement of the door will again be forced into wedging engagement with the raised rib l1 of the door frame attachment member l0.

It will thus be seen that the device hereinbefore described is capable of permitting full opening movement of the door, may be installed to the door and door frame with comparative facility, and is susceptible of unusually economical manufacture.

Other modes of applying the principle of my invention may be employed instead of the one explained, change being made as regards the mechanism herein disclosed, provided the means stated by any of the following claims or the equivalent of such stated means be employed.

I therefore particularly point out and distinctly claim as my invention:-

1. In a door check, the combination of a fluid piston and cylinder attached to the door, a rod member extending from said piston, a link member pivotally connected at one end to the rod member and at its other end to the door frame, and means for initially retarding and then freeing the pivotal movement of said link member in a direction the same as that of the opening of the door.

2. In a door check, the combination of a fluid piston and cylinder attached to the door, a rod member extending from said piston, a link member pivotally connected at one end to said rod member, and a projecting member attached to the door frame, said projecting member having a portion of its surface adapted to initially bindingly engage said link member and to finally become free of said link member during the pivotal movement of the latter in the same direction as that of the opening of the door.

3. In a door check, the combination of a fluid piston and cylinder attached to the door, a rod member extending from said piston, a link member pivotally connected at one end to said rod member, a projecting member attached to the door frame, said projecting member being adapted to engage said link member and being pivotally attached thereto, and a raised portion on said projecting member adapted to initially make a wedging engagement and nally a free engagement with said link member during the pivotal movement of the latter in the same direction as that of the opening of the door.

4. In a door check, the combination of a fluid piston and cylinder attached to the door, a rod member extending from said piston, a link member pivotally connected at one end to said rod member, a projecting member attached to the door frame, said projecting member being adapted to engage said link member and being pivotally attached thereto, and a raised portion on said projecting member adapted to initially make a wedging engagement with said link member and finally to become free of engagement with said link member during pivotal movement of the latter in the same direction as the opening of the door, said raised portion being positioned at a point away from the door and beyond the pivotal point of attachment to said link member.

5. In a door check, the combination of a fluid piston and cylinder attached to the door, a rod member extend from said piston, a channel. shaped link member pivotally connected at one end to said rod member, a projecting member attached to the door frame, said projecting member being adapted to engage the flanges of said channel shaped link member and being pivotally attached thereto, a raised portion on said projecting member adapted to initially make a wedging engagement with said link member and nally to become free of engagement with said link member during pivotal movement of the latter in the same direction as the opening of the door, said raised portion being positioned at a point away from the door and beynd the pivotal point of attachment to said link member.

6. In a door check, the combination of a fluid piston and cylinder attached to the door, a rod member extending from said piston, a link member pivotally connected at one end to the rod member, and frictional pivot means connected to the other end of said link member and adapted to be attached to the door frame, said frictional means being adapted to initially retard and nally free the pivotal movement of said link member in a direction the same as that of the opening of the door.

7. In a door check, the combination of a uid piston and cylinder attached to the door, a rod member extending from said piston, a link member pivotally connected at one end to the rod member, the other end of said link member adapted to be pivotally attached to the door frame, and friction detent means for initially retarding and iinally freeing the pivotal movement of said link member with respect to the door frame and in the same direction of movement as that of the opening of the door.

LAURENCE N. HOFFMAN. 

